1221230309178 has 32 divisors (see below), whose sum is σ = 2664884306880. Its totient is φ = 370016760960.

The previous prime is 1221230309177. The next prime is 1221230309179. The reversal of 1221230309178 is 8719030321221.

It is an interprime number because it is at equal distance from previous prime (1221230309177) and next prime (1221230309179).

It is not an unprimeable number, because it can be changed into a prime (1221230309177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 860443 + ... + 1784046.

It is an arithmetic number, because the mean of its divisors is an integer number (83277634590).

Almost surely, 2^{1221230309178} is an apocalyptic number.

1221230309178 is an abundant number, since it is smaller than the sum of its proper divisors (1443653997702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221230309178 is a wasteful number, since it uses less digits than its factorization.

1221230309178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651502.

The product of its (nonzero) digits is 36288, while the sum is 39.

The spelling of 1221230309178 in words is "one trillion, two hundred twenty-one billion, two hundred thirty million, three hundred nine thousand, one hundred seventy-eight".